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Unit 19: Biology Part 2 Page 15 of 137

Phagocytosis – Process in which phagocytes destroy pathogens and debris

pharynx – tube through which food and air travels; commonly called the
throat

Pinna – The outer ear

Pivot joints- Joint structure in which the end on one bone rotates within a
ring-type structure which can be made partly of bone and partly of ligament;

example includes the joint between the radius and ulna.

Plaque – Material that can build up and block arteries

Plasma – The liquid part of blood

Platelet – Part of the blood that assists in clotting

Protein - Nutrients made up of smaller molecules called amino acids; give
your body energy; help control body processes; organic compound.

Protozoa – Single-celled organisms with nuclei

Pulmonary Artery – Artery that takes blood from the heart to the lungs

Pulmonary Circulation – Circulation of blood from the heart to the lungs, and

back to the heart

Pulmonary Vein – Vein that takes blood from the lungs back to the heart

Pupil – Small black opening in the eye that lets in light

Red Blood Cell – Disc-shaped cell that carries oxygen

Red marrow-

Reflex Arc – Nerve impulse that only makes it to the spinal cord, and never
gets to the brain

Retina – Area at the back of the eye on which light is focused

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